Three of the largest grid operators in the country set new records for peak hourly electricity demand in summer 2026. PJM Interconnection reached 162.6 gigawatts on July 2, the Electric Reliability Council of Texas reached 91.1 gigawatts on July 22, and the Southwest Power Pool reached 58.0 gigawatts on July 27, according to the Energy Information Administration.
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The three records came in different weeks, in different regions and from different mixes of customers, which is part of what makes the set interesting. The largest relative jump came in Texas, where the grid carried 6.5% more load than at its previous peak, while PJM, the biggest of the three by far, edged past its old mark by a much narrower 1.3%. Each operator reports its own load, so the three figures are separate records rather than parts of one national total.
The three records, operator by operator
EIA’s Oct. 15 analysis draws on Form EIA-930 data from the agency’s Hourly Electric Grid Monitor, and reports each operator’s new peak against the old one. The EIA article on summer peak load records lists PJM at 162.6 GW, up 1.3% from a prior record of 160.6 GW set on June 23, 2025.
ERCOT, which serves most of Texas, topped its previous record by 6.5%. The 91.1 GW peak on July 22 compares with 85.5 GW on Aug. 20, 2024, and EIA’s earlier coverage of an ERCOT demand peak describes how fast that grid has been growing. The Southwest Power Pool, whose territory stretches across the central plains, hit 58.0 GW against a prior mark of 56.0 GW from Aug. 21, 2023, a 3.5% increase. SPP publishes its own operating figures on its fast facts page.
One detail separates these records from a routine hot week. PJM’s old record was only a year old, set in June 2025, so the market covering Washington, Chicago and much of the mid-Atlantic broke its own mark within a single cycle. ERCOT and SPP were chasing records that dated back to August 2024 and August 2023. In every case the new peak arrived in July, which is earlier than the August dates attached to two of the old records.
Why other operators came close without breaking records
Several other regions also had heavy summers without setting new highs. EIA reports that CAISO, ISO New England, NYISO and MISO each came within 4% of their prior records. NYISO described preparations for the heat in a press release on heat-wave readiness, which was issued as the state’s grid operator prepared for high demand on the system.
MISO, one of the largest operators in the central United States, makes the contrast sharpest. Its 2026 peak of 121.5 GW arrived on June 30, still below the 127.1 GW record it set on July 20, 2011. That gap shows that a record depends on where demand is growing as much as on how hot the weather turns, since MISO’s 2026 peak remained about 5.6 GW below a mark that has stood for fifteen years.
The broader weather backdrop was extreme. The EIA analysis links to coverage from FOX Weather on the summer being the hottest on record in the United States, which provides the climatic setting for the load numbers. Heat alone does not settle the question, though, because a record also reflects how many customers, data centers and air conditioners are connected to each grid.
How the records were measured and what they leave out
All of these figures come from balancing authorities reporting hourly load to EIA, and the agency publishes a note on data quality for Form EIA-930 that describes how the underlying hourly submissions are collected. A peak hourly load is a one-hour average, not an instantaneous spike, and it is a measure of demand served rather than demand wished for.
That distinction matters because a record peak says nothing by itself about reliability. A grid can set a demand record and meet it comfortably with generation to spare, or it can strain at a lower peak if plants are offline. EIA’s analysis reports the load figures and the dates; readers looking for outage or emergency-alert history will need to consult each operator’s own records.
For readers who want the structure behind the acronyms, EIA maintains an overview of how regional transmission organizations run wholesale power markets across much of the country. PJM, ERCOT and SPP are among the largest of those operators, and their summer records now serve as the new benchmarks that planners and traders will measure future summers against. The 2026 numbers also give a clear yardstick for the next heat wave: PJM must beat 162.6 GW, ERCOT 91.1 GW and SPP 58.0 GW to set another record.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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